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Proper connection for overcurrent relay with parallel CT's

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    Parallel CT

    Quote Originally Posted by marvinray View Post
    Two parallel feeder cables with individual 400:5 CTís per parallel run are connected to one overcurrent relay per phase. The proper connection would be:

    a. Parallel additive with relay set to 800:5
    b. Parallel subtractive with relay set to 800:5
    c. Series additive with relay set to 400:5
    d. Series subtractive with relay set to 400:5

    Please help me solve this question.
    Answer is A, https://ctlsys.com/support/measuring...el-conductors/

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